Add undocumented IOSet (#506)

Also see #467
atsamd-rs · Oct 10, 2021 · 17afec4 · 17afec4
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,5 +1,6 @@
 # Unreleased Changes
 
+- Add undocumented but valid IOSet for ATSAMD5x/ATSAME5x (#506)
 - Fixed the RTC implementation of embedded-hal timer traits to be periodic again (#490)
 
 ---

diff --git a/hal/src/sercom/v2/pad.rs b/hal/src/sercom/v2/pad.rs
@@ -275,6 +275,19 @@ seq!(N in 1..=6 {
     }
 });
 
+/// Type-level variant of [`IoSet`] representing an undocumented SERCOM
+/// IOSET
+///
+/// See the [type-level enum] documentation for more details on the pattern.
+///
+/// [type-level enum]: crate::typelevel#type-level-enum
+#[cfg(feature = "min-samd51g")]
+pub enum UndocIoSet1 {}
+#[cfg(feature = "min-samd51g")]
+impl Sealed for UndocIoSet1 {}
+#[cfg(feature = "min-samd51g")]
+impl IoSet for UndocIoSet1 {}
+
 /// Type class for SERCOM pads in a given [`IoSet`]
 ///
 /// This trait is used to label each [`Pin`] implementing [`IsPad`] with its

diff --git a/hal/src/thumbv7em/sercom/v2/impl_pad.rs b/hal/src/thumbv7em/sercom/v2/impl_pad.rs
@@ -427,3 +427,11 @@ pad_table!(
         D: (Sercom3, Pad3, IoSet4),
     }
 );
+
+// Implement an undocumented `IoSet` for PA16, PA17, PB22 & PB23 configured for
+// `Sercom1`. The pygamer & feather_m4 uses this combination, but it is not
+// listed as valid in the datasheet.
+impl InIoSet<UndocIoSet1> for Pin<PA16, Alternate<C>> {}
+impl InIoSet<UndocIoSet1> for Pin<PA17, Alternate<C>> {}
+impl InIoSet<UndocIoSet1> for Pin<PB22, Alternate<C>> {}
+impl InIoSet<UndocIoSet1> for Pin<PB23, Alternate<C>> {}